Improve handling of help switch in enc test app

welsenc.exe -h is now a valid command which returns success.

No longer prints help text twice in the case when the -h switch
is given along with a wrong cfg.
Merge pull request #53 from varunbpatil/cleanup

Improve handling of help switch in enc test app
Add FreeBSD platform makefile

Add platform-freebsd.mk makefile to allow building on FreeBSD.

OpenH264 builds and runs successfully on FreeBSD 9.2-RELEASE amd64, with both
the gcc and clang compilers.

Note that building i386 binaries with the native toolchain using the -m32 flag
on amd64 FreeBSD is unsupported and will not work, so ENABLE64BIT should always
be set to Yes when compiling on a FreeBSD amd64 system.
Don't link to libdl when building with NO_DYNAMIC_VP defined
Merge pull request #55 from mstorsjo/no-libdl

Don't link to libdl when building with NO_DYNAMIC_VP defined
Merge pull request #54 from rmuch/freebsd-build

Add FreeBSD platform makefile